import time
scale = 10
print("------执行开始------")
for i in range(scale + 1):
    a = "*" * i
    b = "·" * (scale - i)
    c = (i / scale) * 100
    print("{:^3.0f}%[{}—>{}]".format(c, a, b))
    time.sleep(0.1)
print("------执行结束------")